In the last 30 million years,the region between the eastern Sierra Nevada in California and the Wasatch Mountain front in central Utah has contracted in an east-west direction,so Nevada is now half of its former width.

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In the last 30 million years, the region between the eastern Sierra Nevada in California and the Wasatch Mountain front in central Utah has actually expanded in an east-west direction, so Nevada is now wider than it was previously. This expansion is due to Basin and Range extension.

In the Last 30 Million Years,the Region Between the Eastern